Gas-meter.



PATENTED NOV. 14, 1905.

E. HAAS.

GAS METER. APPLICATION FILED JUNE 27,1902.

No. 804,465. PATENTED NOV. 14,1905. E. HAAS.

GAS METER.

APPLICATION FILED JUNE 27, 19024 2 SHBETSSIIEET Z NEE EMIL HAAS, OFMAINZ, V GERMANY.

GAS-METER.

Specification of Letters Patent.

Patented Nov. 14, 1905.

Application filed June 27,1902. Serial No. 113,457.

To all whom it may concern:

Be it known that I, EMIL HAAs, manufacturer, residing at Rheinallee No.31, Mainz, in the Grand Duchy of Hesse, Germany, have invented new anduseful Improvements in Gas-Meters, of which the following is aspecification.

The herein-described gas-meter belongs to that class of dry gas-metersin which a disk is moved to and fro parallel to itself, the edge of thedisk being attached to a membrane, which in turn is fastened by itsouter margin to the boundary of the measuring-chamber. This kind ofgas-meter has hitherto been constructed on the principle of thebellows-pump in so far that the reciprocating disk was of about the samearea as the bottom plate of the apparatus to whose edge the other end ofthe bag-shaped membrane was fastened. In

practice this form involves various disadvantages. The folds formed inthe membrane are very close and sharp, so that the material of themembrane suffers very much. Whether the membrane be distended or folded,the internal gas-pressure exerts a certain outwardlyexpansive action, sothat the internal capacity varies slightly with the pressure, and theexactitude of the measurement is consequently effected. Finally, thedirection in which the disk always moves is only to and from the bottomsurfaces of the measuringchamber, so that the measuring-space is comparatively restricted.

According to the present invention the gasmeter is far improved, so thatwith a single disk and a single membrane nearly twice the volume of gascan be measured. This is attained by making the disk considerablysmaller than the bottom surface of the measuring-chamber to whose edgethe outer margin of the membrane is fastened. The disk is thus enabledto move freely toward either side of the middle plane and the membranecan be readily deflected toward first one side and then the other. Inorder, however, that I this result may be attained without injury to themembrane or prejudice to the exactitude of the measurement, it isnecessary that a rounded disk be used and that the wall of themeasuring-chamber be so constructed that the membrane may cling asclosely as possible to this wall in both of the extreme positions. Thestandard rectangular shape of the measuring vessel (which is for manyreasons advantageous) can then be adopted tor the attachment of themargm of the membrane. Both sides of the measuring vessel then take theform of bags separated by a central flat partition.

In the accompanying drawings, which show an arrangement of the kinddescribed and in which two measuring vessels of this kind are combined,Figure 1 is an elevation of the gasmeter, onehall thereof being removed.Fig. 2 is a plan view, the wall of the vessel being removed. Fig. 3 isan elevation showing half of the disk with its membrane and half of theouter wall of the measuring vessel, including the corresponding sideelevation of the membrane with disk. Fig. 3 is an edge view of one ofthe measuring vessels. Fig. 4 shows by a sectional view the relativepositions of two measuring vessels in one gas-meter.

A is the disk, movable to and fro parallel to itself and connected withthe measuringchamber through the medium of the membrane B along theedges X X X thereof The disk A is substantially circular in the form.illustrated, while the bag-shaped casing or measuring-chamber C has asubstantially rectangular outline. The to-and-fro movement of this diskis transmitted, by means of an arm H, to the axle p, which is thuscaused to oscillate, its motion being transmitted by a rod 7) to theslide-valve a and by a rod 9 to the registering device 0, constructed inany suitable manner. It will be observed that the valve is connectedwith each of the disks A, and the same thing is true of the registeringdevice 0. Thus when one of the membranes or diaphragms is moved by thepressure of the gas the other will by the aforesaid connections bebrought back into the proper position for the next operation. Theoperative movement of each diaphragm therefore effects the returnmovement of the other diaphragm.

The upper part of Fig. 4 shows the mid-position of the disk A, in whichthe membrane B extends in gentle undulations from the edge of the diskalong the edges X X X.

In the lower part of Fig. 4 the disk is shown as having reached one ofthe two extreme positions, wherein the lever I-I enters a hollow spaceIt, provided in the wall of the vessel.

Now what I claim, and desire to secure by Letters Patent, is thefollowing:

1. A fluid-meter comprising a polygonal casing or chamber with wallswhich in crosssection are straight and parallel at their centralportions and curved and converging at outline the enter edge of which issecured to said casing; a flatj late or disk of curved outline securedto tie inner edge of said diaphragm, and indicatingInechanism'operatively connected With said disk.

In testimony whereof-I have signed my name to this specification in thepresence of 20 two subscribing Witnesses.

v EMIL HAAS.

Witnesses ROBERT BI'iHL, EVA SATTLER.

